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Summary: The effects of NO-Fluvastatin on proliferation of human lens epithelial cells (HLECs) and the action mechanism were investigated. Cell proliferation was assessed by MTT assay. Cell cycle was analyzed by flow cytometry. The expression of cell cycle regulatory proteins CyclinE mRNA and P21wafl mRNA was detected by reverse transcription polymerase chain reaction (RT-PCR). MTT staining colorimetry showed that HLECs proliferation was markedly inhibited by NO-Fluvastatin and the effect was dependently related to time (24, 48 and 72 h) and dosage (1, 5 and 20 μmol/L). Flow cytometry revealed that NO-Fluvastatin could significantly block HLECs in the G0/G1 phase, resulting in the increased cells in the G0G1 phase and decreased in the S phase (P